Daikin EWAD Fault Code H1
Daikin EWAD Fault Code H1 is a critical safety alarm indicating: High pressure switch activated. The most common causes include Discharge pressure exceeding safety limit. Estimated repair time: 2-4 hours (requires leak repair, evacuation, and refrigerant recharge). This alarm requires immediate attention by a certified HVAC technician.
Alarm Description
High pressure switch activated
Brand: Daikin | Model: EWAD (Screw Compressor Chiller) | Code: H1 | Severity: Critical
Observable Symptoms
- Compressor shuts down on high pressure safety cutout
- Discharge pressure gauge reads above normal operating range
- Condenser may feel hot to touch or airflow feels restricted
What to Check First
Before diving into detailed diagnostics, start with this quick first check:
Probable Causes
- Discharge pressure exceeding safety limit
- Condenser not rejecting heat adequately
- Non-condensables in refrigerant system
Recommended Inspection Steps
- Check condenser operation and cleanliness
- Verify condenser fan or water flow
- Check for non-condensables using temperature approach
- Vent non-condensables if present
- Verify refrigerant charge amount
Required Tools & Equipment
- Coil cleaning brush and coil cleaner
- Infrared thermometer or calibrated temperature probe
- PT chart for refrigerant type
- Refrigerant manifold gauge set
- Safety PPE (gloves, safety glasses, face shield)
Estimated Repair Time
2-4 hours (requires leak repair, evacuation, and refrigerant recharge)
When to Call a Professional
- If the fault persists after completing all recommended inspection steps
- If you observe unusual noises, vibrations, or oil leaks from the compressor
- If refrigerant charge levels are outside OEM specifications and EPA-certified recovery is needed
- If electrical measurements show voltage imbalance greater than 2% between phases
- If the fault recurs immediately after reset, indicating an unresolved safety condition
- Contact an authorized Daikin service representative for warranty-covered repairs
Related Fault Codes
Other Daikin EWAD codes that may be related:
OEM Service Manual Reference
OEM Reference: Daikin EWAD Air-Cooled Screw Chiller Service Manual. Available through Daikin Applied technical support.
Frequently Asked Questions
What does Daikin EWAD fault code H1 mean?
Fault code H1 on a Daikin EWAD chiller indicates: High pressure switch activated. This is a critical safety alarm that requires diagnostic attention.
What causes Daikin EWAD alarm code H1?
Common causes include: Discharge pressure exceeding safety limit; Condenser not rejecting heat adequately; Non-condensables in refrigerant system
How do I fix Daikin EWAD error code H1?
Follow the recommended inspection steps below. Start with the quick check, then proceed through each step. If the fault persists after all steps, contact an authorized Daikin service representative.